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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
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  <title>Document</title>
</head>

<body>
  <script>
    var arr = [{label:'男',value: 1}, {label:'女',value: 0}]
    const obj2 = {}
    function f(arr) {
      // 写代码，得到
      // 使用forEach给对象上添加属性名和属性值
      arr.forEach(item => {
        console.log(item.value);  //  1 0
        obj2[item.value] = item.label  // {0: '女', 1: '男'}
      })
    }
    f(arr)
    console.log(obj2);
    // obj2 = {'1': '男'， '0': '女'}
  </script>
</body>

</html>